Link to Study

Cardiovascular disease risk factors in women with O-desmethylangolensin producing and non-producing gut microbial metabotypes: an observational study.  
https://doi.org/10.1186/s12872-026-06007-0

The Core Issue

Not everyone's gut bacteria work the same way. Some people have microbes that convert a soy compound called daidzein (an isoflavone, or plant estrogen) into a metabolite called ODMA. Others simply don't. This study asked whether that difference might show up in heart health markers.

The Finding

Women whose gut bacteria couldn't produce ODMA had systolic blood pressure (the top number in a reading) nearly 8 mmHg higher than women who were high producers. A trend toward higher fasting blood sugar was also observed in non-producers, though that result didn't cross the threshold for statistical significance.

Why It Matters

An 8 mmHg difference in blood pressure isn't trivial. This suggests your gut's ability to process soy could be quietly shaping cardiovascular risk, and it points to gut microbiome composition as a potentially meaningful but overlooked factor in heart health for women.

Limitations of Study

The sample was relatively small at 148 women, and only women who already ate soy or took isoflavone supplements were included. The results need to be replicated in larger, more diverse populations before drawing firm conclusions.

Interesting Statistics

• 148 women from the Study of Women's Health Across the Nation (SWAN) were included  
• 23 were non-producers, 90 were low producers, and 35 were high producers  
• Non-producers showed a mean systolic blood pressure about 7.6 mmHg higher than high producers  
• A trend toward roughly 6 mg/dl higher fasting glucose was seen in non-producers, but it didn't reach significance

Useful Takeaways

If you eat soy regularly, your gut bacteria may determine how much cardiovascular benefit you actually get from it. Testing or improving gut microbiome diversity could eventually matter as much as the diet itself.

TL;DR

Women whose gut bacteria can't convert soy compounds into ODMA show meaningfully higher blood pressure, suggesting your microbiome may be a hidden variable in heart disease risk.

Two women eat the same soy diet and one has blood pressure nearly 8 points higher: the difference comes down to these specific gut microbes